Hammer mill



J. G. WILSON Nov. 25, 11929.

HAMMER MILL 2 Sheets-Sheet Filed Jan. 4, 1928 INVE NTOR Jaimb Gzir ml wm Has ATTORNEYS v Nov. 26, 1929.

J. G. WILSON HAMMER MILL 2 Sheets-Sheet Filed Jan. 4, 1928 ms TTORNEYS Patented Nov. 26, 1929 romw GILMORE wnson, or non, PENNSYLVANIA HAMMER mm.

Application filed January 4, 1928. Serial No. 244,481.

This invention relates to hammer mills and other types of pulverizing machinery.

An object of the invention is to provide machines of the class specified with a detachable bottom, so that the discharge screens can be removed without disassembling the machines.

Another object is to provide pulverizing machines with a discharge screen retaining frame that is suspended from the bottom or the machines in such a way that the frame can be drop d to permit removal and replacement 0 the screen.

Another object is to produce an efficient, strong and durable pulverizing machine which may be economically constructed and operated.

Other objects and advantages will hereinafter appear.

The views of the drawings are Figure 1 is an elevation of a hammer mill constructed according'to my invention;

Fig. 2 is a view similar to Fig. 1, partly in section, the screen and its supporting frame being shown in a lowered position to permit removal of the screen from the machine;

Fig. 3 is a plan of the screen supporting frame;

Fig. 4 is a perspective of the screen; Fig. 5 is a detail vertical section as seen from the line 55 of Fig. 1; and

Fig. 6 is an elevation, partly in section, of a portion of a hammer mill equipped with a grid screen.

Referring to the drawings, the machine comprises a base 10, having lateral extensions 11 on each end which extensions are mounted on concrete pillars 12, or other suitable supporting means. i

The base 10 has bearings 13 in which is journalled a shaft 14, upon which is mounted rotors 15, carrying a plurality of hammers 16.

The rotors 15, and associated parts, are enclosed by a casing, including an intermediate portion 17, and an upper semi-cylindrical portion 18.

One end of the upper portion 18 of the easing may be in the form of a hopper 19, for 50 receiving the material to be ground.

Suspended beneath the base 10, is a frame 20; The upper portion of this frame is formed with an outwardly projecting flange 21, which is secured to a flange 22 formed on glge bottom of the base 10, by means of bolts The lower surface of the longitudinal sides of the frame 20 are curved in the manner illustrated so as to provide the sides of the bottom of the frame with an irregular contour including parallel central depending circular portions 24, and parallel reversely curved outer portions 25.

Disposed beneath the frame 20 is another frame 26, the upper longitudinal edges of which are shaped to conform to the contour of the bottom edges of the frame 20.

The fr'ame 26 is suspended from the base 10 by means of bolts 27, depending from the flanges 22. p

The bolts 27 are passed through perforated lugs 28 formed'on the opposite longitudinal side walls of the frame 26, the shanks of the bolts projecting a considerable distance below the bottom of the frame 26 and having threaded thereon nuts 29. The nuts are screwed up the bolts sufficiently to bear against the under faces. of the lugs 28, and thereby retain the 7 frame 26 in position beneath the frame 20.

The purpose of the frame 26 is to support an arcuate perforated sheet metal plate, constituting a screen 30. This screen is clamped between the adjoining edges of the frames 20 and 26, in the manner illustrated by Fig. 5.

Each end of the frame 26 has integrally; formed therewith, outwardly extending ribs 31.

Suspended beneath the base 10, and disposed adjacent to the ends of the frame 26, are Z bars 32, having inwardly projecting lower flanges 33 disposed beneath the ribs 31 (see Fig. 1).

The arrangement of the parts is such that the bottom of the machine is unobstructed, and therefore the frame 26 can be lowered to permit removal of the screen without disassembling the machine.

-When it is desired to remove the "screen r01" any purpose, such as for repairing or replacement, the nuts 29 on one side of the frame 26 can be unscrewed from the bolts 27, and the bolts withdrawn, thus, leaving the frame supported only by the bolts on one side of the machine.

The nuts on the bolts on the side of the frame opposite to that from which the bolts have been removed, are now unscrewed sufficiently to permit the frame 26 to drop down until the ribs 3l rest on the inturned flanges 33 of the angles 32.

The screen 30 can be readily removed through the space provided between the frames 20 and 26, and a new screen can be inserted.

The bolts which were removed are now replaced, and the nuts screwed up on all of the bolts. This action will force the screen 30 up against the frame20, and due to construction of the adjacentedges of the frames 20 and 26, the screen will be clamped firmly in position, as will readily be understood.

Inthe form of the invention shown in Fig. 6, a grid screen 35 is disposed between the bottom surfaces of a frame 36 suspended from the base 10, and the upper flat surface of a frame 37 functioning in a manner similar to the frame 26 heretofore described. Aside from altering the contours of the adjacent surfaces of the frames 36.and 37 so that such frames will conform to perimeter of the grid screen 35 no other changes need be made in constructing this form of the invention.

The invention set forth herein is, of course, susceptible of various modifications and adaptations.

The invention claimed isz 1. In combination with a pulverizing machine having a base supported at each end so that its bottom is unobstructed and accessible from'the exterior, a thin, substantially continuous-surfaced, perforate screen closing the bottom of the machine and retaining means for the screen suspended from the base, for bodily removement therefrom, permitting removement of the screen in its entirety from the base.

2. A pulverizing machine having a base provided with end extensions adapted to be mounted on supporting pillars, said base having a bottom flange, a frame suspended from said flange, a second frame removably suspended from the said base flange, and a screen interposed between the said frames, in such manner that the screen may be quickly removed in its entirety without dismantling the machine.

3. A pulverizing machine having a base, the ends of said base being so supported that the bottom of the machine is unobstructed and accessible from the exterior, a frame suspended from the base, a second frame disposed beneath the said first frame, the adjoining edges of the said frames having an irregular contour, and a replaceable screen interposed between the said frames, the constructlon permitting the removal of the screen in its entiretyfrom the base.

4. A pulverizing machine having a base, the ends of said base being so supported that the bottom of the machine is unobstructed and accessible from the exterior, a frame suspended from the base, a second frame disposed beneath the said first frame, a replaceable screen interposed between the said frames, and removable retaining means for the said'second frame, permitting removal of the screen in its entirety from said base.

5. A pulverizing machine having a base, the ends of said base being so supported that the bottom of the machine is unobstructed and accessible from the exterior, a frame suspended from the base, a second frame disposed beneath the said first frame, a thin, substantially continuous-surfaced perforate screen interposed between the said frames, de-

from each of said frames and interposed therebetween, in such manner that the screen may be quickly removed in its entirety from said machine without requiring dismantling thereof.

JOHN GILMORE WILSON. 

